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Unraveling the Synergy of Interface Engineering Α-Mno2/Bi2wo6 Heterostructure and Defective Active Sites for Superdurable Photocatalysis: Mechanism Insights of Charge Separation/Transfer

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SSRN 2023年

作者： Arif, Muhammad Mahsud, Ayaz Ali, Amjad Liao, Shipeng Chen, Yinjuan Xia, Jiawei Xiao, Hai Azam, Mohammad Chen, Haiqun Muhmood, Tahir Lu, Zhansheng Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation Center Changzhou University Changzhou213164 China School of Physics Henan Normal University Xinxiang453007 China Linköping University Department of Science and Technology Laboratory of Organic Electronics NorrköpingSE‐60174 Sweden Department of Chemistry Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Tsinghua University Beijing100084 China Department of Chemistry College of Science King Saud University PO Box 2455 Riyadh11451 Saudi Arabia Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and Materials College of Science Nanjing Forestry University Nanjing210037 China

The construction of visible-light-driven hybrid heterostructure photocatalysts is of great significance for environmental remediation, though the utilization of strong visible-light response photocatalysts with high efficiency and stability remains a major challenge. Defect engineering is an excellent way to introduce metal cation vacancies in materials, thereby ensuing in highly enhanced catalytic performance. Inspired by this, we effectively constructed a built-in interface α-MnO2/Bi2WO6 heterostructure with abundant intimate interfaces and defective Mn3+/Mn4+ active sites for photocatalytic tetracycline hydrochloride (TC-HCl), hexavalent chromium Cr(VI) reduction, and Escherichia coli (E. coli) inactivation. The experimental results, such as the active species test and the X-ray photoelectron spectroscopy, indicated that the defective sites Mn3+/Mn4+, surface oxygen vacancies, and the Bi(3+x)+ boosted the visible light absorption, and highly enhanced the photoinduced charge separation/transfer. Furthermore, experimental and DFT calculations reveal the high charge density at the built-in interface heterostructure and the Z-scheme charge transfer mechanism during the photocatalytic process. The results further reveal that the •O2- and 1O2 are the main reactive active species contributing to the photocatalytic reaction. The exceptional TC-HCl decomposition activity of α-MnO2/Bi2WO6 heterostructure (97.56%, 2.31, and 2.04 higher than bulk), the enhanced reaction kinetics (Kapp= 0.041 min-1, 6.4, and 5.2 times higher than bulk), removal rate 80.3%, Cr6+ reduction to Cr3+ (98.56%, Kapp= 0.0599 min-1), and almost 100% bacterial inactivation compared to bulk α-MnO2 (42.22%) and Bi2WO6 (47.76%), mainly due to the enhanced charge separation/transfer at the built-in interface and high charge density. The study opens new horizons for constructing Z-Scheme MnO-based interface heterostructures with abundant defective sites for exceptional photocatalytic applications. © 2023, T

关键词： Bismuth compounds

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Harnessing the Unconventional Cubic Phase in 2D LaNiO3Perovskite for Highly Efficient Urea Oxidation

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Angewandte Chemie 2024年第1期137卷

作者： Zhiao Wu Miao Fan Prof. Huiyu Jiang Jiao Dai Kaisi Liu Rong Hu Shutong Qin Prof. Weilin Xu Yonggang Yao Prof. Jun Wan State Key Laboratory of New Textile Materials and Advanced Processing Technologies Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing & Finishing Wuhan Textile University Wuhan 430200 China State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Phase engineering is a critical strategy in electrocatalysis, as it allows for the modulation of electronic, geometric, and chemical properties to directly influence the catalytic performance. Despite its potential, phase engineering remains particularly challenging in thermodynamically stable perovskites, especially in a 2D structure constraint. Herein, we report phase engineering in 2D LaNiO 3 perovskite using the strongly non-equilibrium microwave shock method. This approach enables the synthesis of conventional hexagonal and unconventional trigonal and cubic phases in LaNiO 3 by inducing selective phase transitions at designed temperatures, followed by rapid quenching to allow precise phase control while preserving the 2D porous structure. These phase transitions induce structural distortions in the [LaO] + layers and the hybridization between Ni 3 d and O 2 p states, modifying local charge distribution and enhancing electron transport during the six-electron urea oxidation process (UOR). The cubic LaNiO 3 offers optimal electron transport and active site accessibility due to its high structural symmetry and open interlayer spacing, resulting in a low onset potential of 1.27 V and a Tafel slope of 33.1 mV dec −1 for UOR, outperforming most current catalysts. Our strategy features high designability in phase engineering, enabling various electrocatalysts to harness the power of unconventional phases.

关键词： Phase Engineering 2D Material Microwave Interface Chemistry Urea Oxidation Reaction

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Microstructure and Properties Nonuniformity of Ti6al4v Component Fabricated by High-Power Laser Melting Deposition

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SSRN 2024年

作者： Zhang, Zhenlin Zhi, Geng Liu, Yan Chen, Yong Rong, Peng Ma, Sida Xie, Pu Feng, Aixin Chen, Hui School of Materials Science and Engineering Southwest Jiaotong University Sichuan Chengdu610031 China Key Laboratory of Advanced Technologies of Materials Ministry of Education Sichuan Chengdu610031 China Second Institute of China Aerospace Science and Technology Corporation Beijing Institute of Radio Measurement Beijing100854 China Co. Ltd Sichuan Chengdu610073 China Department of Aeronautics and Astronautics Stanford University StanfordCA94305 United States Zhejiang Provincial Key Laboratory of Laser Processing Robots Mechanical Industry Key Laboratory of Laser Precision Machining &Detection Technology Wenzhou University Zhejiang Wenzhou325035 China Ruian Graduate School of Wenzhou University Zhejiang Ruian325207 China

High-power laser melting deposition provides an efficient solution for the fabrication of large-sized titanium alloy components. In this study, Ti6Al4V blocks with well-formed structures were prepared using a 7 kW laser power, and their internal defect distribution, microstructure along the deposition direction, tensile properties, and fatigue performance were investigated. The results showed that the density of the as-deposited Ti6Al4V blocks could reach 99.94%, and the main internal defects were cavities, primarily spherical and dispersed, with a maximum diameter of 326.7 μm. Among them, 65.53% of cavities had a diameter smaller than 100 μm, and 92.76% had a diameter smaller than 200 μm. The microstructure at the top region of the specimen consisted of a needle-shaped α phase, the middle region had a mixture of needle-shaped and lamellar α-phase, and the bottom region showed a lamellar α-phase structure. With an increase in deposition height, the aspect ratio of α-phase increased, and the average width decreased from 3.22 μm to 0.88 μm. The internal structure was mainly composed of a basket-weave structure, with a small amount of Widmanstätten structure present at grain boundaries. Hardness and tensile properties exhibited significant non-uniformity along the deposition height. The tensile strength and yield strength at the top region were approximately 50 MPa higher than those in the middle and bottom regions, while the elongation was about 2% lower. The top region's tensile fracture surface displayed a sawtooth pattern, whereas the middle and bottom regions exhibited fractures along the 45° direction of the principal stress. The length of α-bundles and the interface density within the bundles were crucial factors affecting crack propagation. In the top region, α bundles were the longest, and the interface density was the highest. During crack propagation, when the crack extended perpendicular to the α bundles, it encountered high resistance, and when it extended

关键词： Titanium alloys

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Preparation and characterization of composite magnetic particles and aqueous magnetorheological fluids

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Journal of Physics: Conference Series 2009年第1期149卷

作者： H B Cheng J M Wang Q J Zhang N M Wereley State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 430070 Wuhan P.R.China Department of Aerospace Engineering University of Maryland 3180 Martin Hall College Park MD 20742 USA

Composite magnetic particles (CMPs) with carbonyl iron (CI) core and N-glucose ethylenediamine triacetic acid (GED3A) shell were prepared by an in-situ chelating reaction, where the CI surface was coated with GED3A. And novel kind of aqueous magnetorheological (MR) fluids were prepared with thus obtained CMPs. The properties of CMPs, including morphology, structure, and magnetic behaviours were characterized, and the magnetorheological properties of the MR fluids were analyzed via a strain-controlled rheometer. It was found that the MR fluids exhibited high shear stress and quick response rate to magnetic field. Furthermore, the dispersion stability and the anti-oxidation property were substantially improved as revealed by stability test.

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Preparation and properties of ATO films and their effects on the TiO2/ATO system

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Journal of Physics: Conference Series 2013年第1期419卷

作者： J A Galaviz-Pérez Fei Chen J R Vargas García Qiang Shen Lianmeng Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 PR China To whom any correspondence should be addressed Department of Materials and Metallurgical Eng. National Polytechnic Institute México 07300 DF México

Multilayered TiO2/ATO thin films were prepared by the spin-coating method to evaluate the electronic interactions and the effect of the experimental conditions on optical transparency, electric resistivity and carrier density. ATO chemical composition, number of layers and annealing temperature were modified to study their effect on the global properties of the TiO2/ATO system. TiO2/ATO films exhibited an optical transparency as high as 81 % in the visible wavelength and a strong absorption within the UV spectra. Electric resistivity as low as 3.4 × 10−1 Ωcm was measured for TiO2/ATO films. Optical properties were influenced mainly by the presence of upper TiO2 layer and ATO film thickness. The effect of ATO film thickness, composition and annealing temperature on TiO2/ATO transparency and resistivity are discussed.

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Alloying effect enhanced bimetallic Ni-Fe/TiO 2 catalysts for selective hydrogenation of 1,3-butadiene in the presence of an excess of propylene

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Molecular Catalysis 2023年 550卷

作者： Wei-Hao Wang Bo Jiang Zhao Wang Ya Chen Yao Li Ting-Ting Luo Feng Cheng Bao-Lian Su The State Key Laboratory of Advanced Technology for Material Synthesis and processing Wuhan University of Technology Wuhan 430070 China Center for Materials Research and Analysis Wuhan University of Technology Wuhan 430070 China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 Rue de Bruxelles B-5000 Namur Belgium

Nickel is a promising Pd alternative candidate for selective alkynes/alkadienes hydrogenation owing to its high catalytic activity and cheap price, however, with fatal restrictions of low alkenes selectivity and inferior stability caused by its strong olefin adsorption and the cleavage of carbon-carbon bond. Herein, controlled amounts of iron were introduced into nickel as catalytic assistant by deposition-precipitation with urea on TiO 2 support. Using 1,3-butadiene in an excess of propylene to simulate the industrial process, the additional Fe shows a significant enhancement to the catalytic performance of Ni, i.e., Ni-Fe/TiO 2 with Ni/Fe atomic ratio 1:0.33 shows >94% of 1,3-butadiene conversion and >95% of alkenes selectivity after above 200 h of time on stream, superior to that of commercial Pd/Al 2 O 3 catalyst. Further in-situ analysis reveals that the alloying effect from the formation of Ni-rich Ni-Fe intermetallic compound (e.g., Ni 3 Fe alloy) enlarges the distance between two Ni active sites and enriches the electronic density of Ni sites, resulting in a weak adsorption of butenes products for offering such excellent catalytic performance. To the best of our knowledge, this is the first in-depth exploration on supported Ni-Fe bimetallic catalyst for selective hydrogenation of light alkynes/alkadienes. It shows a high potential for replacing the commercial Pd-based catalysts.

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Tungsten-Doped L10-PtCo Ultrasmall Nanoparticles as a High-Performance Fuel Cell Cathode

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advanced materials 2019年第43期58卷 15617-15623页

作者： Liang, Jiashun Li, Na Zhao, Zhonglong Ma, Liang Wang, Xiaoming Li, Shenzhou Liu, Xuan Wang, Tanyuan Du, Yaping Lu, Gang Han, Jiantao Huang, Yunhui Su, Dong Li, Qing State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Center for Functional Nanomaterials Brookhaven National Laboratory UptonNY11973 United States Frontier Institute of Chemistry Frontier Institute of Science and Technology jointly with College of Science Xi’an Jiaotong University Shanxi Xi’an710054 China Department of Physics and Astronomy California State University NorthridgeCA91330 United States Faculty of Materials Science and Chemistry China University of Geosciences Hubei Wuhan430074 China College of Materials Science and Engineering Changsha University of Science and Technology Changsha410114 China School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin300350 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Science and Technology Inner Mongolia University Hohhot Inner Mongolia010021 China

The commercialization of proton exchange membrane fuel cells (PEMFCs) relies on highly active and stable electrocatalysts for oxygen reduction reaction (ORR) in acid media. The most successful catalysts for this reaction are nanostructured Pt-alloy with a Pt-skin. The synthesis of ultrasmall and ordered L10-PtCo nanoparticle ORR catalysts further doped with a few percent of metals (W, Ga, Zn) is reported. Compared to commercial Pt/C catalyst, the L10-W-PtCo/ C catalyst shows significant improvement in both initial activity and high-temperature stability. The L10-W-PtCo/C catalyst achieves high activity and stability in the PEMFC after 50000 voltage cycles at 80°C, which is superior to the DOE 2020 targets. EXAFS analysis and density functional theory calculations reveal that W doping not only stabilizes the ordered intermetallic structure, but also tunes the Pt-Pt distances in such a way to optimize the binding energy between Pt and O intermediates on the surface. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Platinum alloys

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Ammonium Ion Batteries: Material, Electrochemistry and Strategy

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Angewandte Chemie 2023年第23期135卷

作者： Runtian Zheng Yuhang Li Dr. Haoxiang Yu Xikun Zhang Dr. Ding Yang Dr. Lei Yan Prof. Yu Li Prof. Jie Shu Prof. Bao-Lian Su School of Materials Science and Chemical Engineering Ningbo University Ningbo 315211 Zhejiang China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles 5000 Namur Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China

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Effect of high temperature treatment on the structure and thermal conductivity of 2D carbon/carbon composites with a high thermal conductivity

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Carbon 2015年 82卷 608-608页

作者： Zhi-hai Feng Zhen Fan Qing Kong Xiang Xiong Bo-yun Huang State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 China Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials and Processing Technology Beijing 100076 China

High thermal conductivity carbon/carbon composites (HTC-C/Cs) have a high specific modulus and a low thermal expansion in addition to all the excellent properties of traditional C/C composites, which have been a research focus in recent years. 2D HTC-C/Cs were prepared by hot pressure molding, densification by precursor impregnation and pyrolysis, and then heat treatment at high temperatures, using pitch-based carbon fiber fabric with a high thermal conductivity as reinforcement and mesophase pitch as the binder precursor. The structure and morphology of pitch-based carbon fibers and 2D HTC-C/Cs were investigated by XRD, SEM and TEM. The thermal conductivity was measured by laser-flash diffusivity. Results show that with increasing heat treatment temperature the crystallite size increases, the degree of order is improved, the thickness of laminar graphite around the carbon fibers increases, and the number of interfacial cracks between the fiber and matrix decrease and cracks between matrix layers are expanded. A linear relationship between thermal conductivity and heat treatment temperature was observed and the highest thermal conductivity was 443 W/m·K after heat treatment at 3000 °C. [New Carbon materials 2014, 29(5): 357–362]

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TiO 2 nanofluid infused nanocoating for long-term anti-corrosion

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Chemical Physics Letters 2023年 830卷

作者： Zi-Yan Xu Jing-jing Xie Hao Yu Yang Ge Wei Geng Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & Shenzhen Research Institute & Laoshan Laboratory Wuhan University of Technology Wuhan 430070 PR China School of Chemical Engineering and Technology Sun Yat-Sen University 2 Daxue Road Zhuhai 519082 PR China

Marine corrosion has been a global problem with the damage on environment, and economy. With the development, traditional coating technology is difficult to meet the current demands of applications. In this study, TiO 2 nanoparticles were modified and dispersed in silicone oil to form TiO 2 nanofluid. And, the nanofluid was infused into hierarchical structure to produce the SLIPS which is obtained by spraying with the solution of Al 2 O 3 , which significantly reduce the lubricant leaching. As synthesized coating shows the good performance in corrosion resistance. The coating prepared by this novel method show the great potential applications in different marine environments.

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